import { inherits as inherits$0 } from "util";
import Hash from "./hash";
/**
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined
 * in FIPS 180-2
 * Version 2.2-beta Copyright Angel Marin, Paul Johnston 2000 - 2009.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 *
 */
var inherits = { inherits: inherits$0 }.inherits;
var K = [
    0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
    0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
    0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
    0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
    0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
    0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
    0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
    0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
    0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
    0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
    0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
    0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
    0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
    0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
    0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
    0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2
];
var W = new Array(64);
function Sha256() {
    this.init();
    this._w = W; // new Array(64)
    Hash.call(this, 64, 56);
}
inherits(Sha256, Hash);
Sha256.prototype.init = function () {
    this._a = 0x6a09e667;
    this._b = 0xbb67ae85;
    this._c = 0x3c6ef372;
    this._d = 0xa54ff53a;
    this._e = 0x510e527f;
    this._f = 0x9b05688c;
    this._g = 0x1f83d9ab;
    this._h = 0x5be0cd19;
    return this;
};
function ch(x, y, z) {
    return z ^ (x & (y ^ z));
}
function maj(x, y, z) {
    return (x & y) | (z & (x | y));
}
function sigma0(x) {
    return (x >>> 2 | x << 30) ^ (x >>> 13 | x << 19) ^ (x >>> 22 | x << 10);
}
function sigma1(x) {
    return (x >>> 6 | x << 26) ^ (x >>> 11 | x << 21) ^ (x >>> 25 | x << 7);
}
function gamma0(x) {
    return (x >>> 7 | x << 25) ^ (x >>> 18 | x << 14) ^ (x >>> 3);
}
function gamma1(x) {
    return (x >>> 17 | x << 15) ^ (x >>> 19 | x << 13) ^ (x >>> 10);
}
Sha256.prototype._update = function (M) {
    var W = this._w;
    var a = this._a | 0;
    var b = this._b | 0;
    var c = this._c | 0;
    var d = this._d | 0;
    var e = this._e | 0;
    var f = this._f | 0;
    var g = this._g | 0;
    var h = this._h | 0;
    for (var i = 0; i < 16; ++i)
        W[i] = M.readInt32BE(i * 4);
    for (; i < 64; ++i)
        W[i] = (gamma1(W[i - 2]) + W[i - 7] + gamma0(W[i - 15]) + W[i - 16]) | 0;
    for (var j = 0; j < 64; ++j) {
        var T1 = (h + sigma1(e) + ch(e, f, g) + K[j] + W[j]) | 0;
        var T2 = (sigma0(a) + maj(a, b, c)) | 0;
        h = g;
        g = f;
        f = e;
        e = (d + T1) | 0;
        d = c;
        c = b;
        b = a;
        a = (T1 + T2) | 0;
    }
    this._a = (a + this._a) | 0;
    this._b = (b + this._b) | 0;
    this._c = (c + this._c) | 0;
    this._d = (d + this._d) | 0;
    this._e = (e + this._e) | 0;
    this._f = (f + this._f) | 0;
    this._g = (g + this._g) | 0;
    this._h = (h + this._h) | 0;
};
Sha256.prototype._hash = function () {
    var H = Buffer.allocUnsafe(32);
    H.writeInt32BE(this._a, 0);
    H.writeInt32BE(this._b, 4);
    H.writeInt32BE(this._c, 8);
    H.writeInt32BE(this._d, 12);
    H.writeInt32BE(this._e, 16);
    H.writeInt32BE(this._f, 20);
    H.writeInt32BE(this._g, 24);
    H.writeInt32BE(this._h, 28);
    return H;
};
export default Sha256;
